linux-kernel - Re: [RFC PATCH v4 4/6] mm: Add page table level flags to vm

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Date:   Tue, 24 Mar 2020 14:44:36 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Zhenyu Ye <yezhenyu2@...wei.com>
Cc:     <will@...nel.org>, <mark.rutland@....com>,
        <catalin.marinas@....com>, <aneesh.kumar@...ux.ibm.com>,
        <akpm@...ux-foundation.org>, <npiggin@...il.com>,
        <peterz@...radead.org>, <arnd@...db.de>, <maz@...nel.org>,
        <suzuki.poulose@....com>, <tglx@...utronix.de>,
        <yuzhao@...gle.com>, <Dave.Martin@....com>, <steven.price@....com>,
        <broonie@...nel.org>, <guohanjun@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-mm@...ck.org>, <arm@...nel.org>, <xiexiangyou@...wei.com>,
        <prime.zeng@...ilicon.com>, <zhangshaokun@...ilicon.com>
Subject: Re: [RFC PATCH v4 4/6] mm: Add page table level flags to vm_flags

On Tue, 24 Mar 2020 21:45:32 +0800
Zhenyu Ye <yezhenyu2@...wei.com> wrote:

> --- a/include/trace/events/mmflags.h
> +++ b/include/trace/events/mmflags.h
> @@ -130,6 +130,16 @@ IF_HAVE_PG_IDLE(PG_idle,		"idle"		)
>  #define IF_HAVE_VM_SOFTDIRTY(flag,name)
>  #endif
>  
> +#ifdef CONFIG_64BIT
> +#define IF_HAVE_VM_LEVEL_PUD(flag,name)	{flag, name}
> +#define IF_HAVE_VM_LEVEL_PMD(flag,name)	{flag, name}
> +#define IF_HAVE_VM_LEVEL_PTE(flag,name)	{flag, name}
> +#else
> +#define IF_HAVE_VM_LEVEL_PUD(flag,name)
> +#define IF_HAVE_VM_LEVEL_PMD(flag,name)
> +#define IF_HAVE_VM_LEVEL_PTE(flag,name)
> +#endif
> +
>  #define __def_vmaflag_names						\
>  	{VM_READ,			"read"		},		\
>  	{VM_WRITE,			"write"		},		\
> @@ -161,7 +171,10 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY,	"softdirty"	)		\
>  	{VM_MIXEDMAP,			"mixedmap"	},		\
>  	{VM_HUGEPAGE,			"hugepage"	},		\
>  	{VM_NOHUGEPAGE,			"nohugepage"	},		\
> -	{VM_MERGEABLE,			"mergeable"	}		\
> +	{VM_MERGEABLE,			"mergeable"	},		\
> +IF_HAVE_VM_LEVEL_PUD(VM_LEVEL_PUD,	"pud-level"	),		\
> +IF_HAVE_VM_LEVEL_PMD(VM_LEVEL_PMD,	"pmd-level"	),		\
> +IF_HAVE_VM_LEVEL_PTE(VM_LEVEL_PTE,	"pte-level"	)		\
>  

Have you tested this on 32bit? It looks like you'll get empty commas there.
Perhaps the defines need to be:

#ifdef CONFIG_64BIT
#define IF_HAVE_VM_LEVEL_PUD(flag,name)	{flag, name},
#define IF_HAVE_VM_LEVEL_PMD(flag,name)	{flag, name},
#define IF_HAVE_VM_LEVEL_PTE(flag,name)	{flag, name}
#else
#define IF_HAVE_VM_LEVEL_PUD(flag,name)
#define IF_HAVE_VM_LEVEL_PMD(flag,name)
#define IF_HAVE_VM_LEVEL_PTE(flag,name)
#endif

And leave out the commas in the list.

-- Steve